linux-kernel - Re: [PATCH 07/13] tracing/kdb: remove redundant checking

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Date:	Mon, 11 Mar 2013 10:09:28 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	"zhangwei(Jovi)" <jovi.zhangwei@...wei.com>,
	Jason Wessel <jason.wessel@...driver.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH 07/13] tracing/kdb: remove redundant checking

This is Jason's code.

Jason, please give an Ack or Nack.

Thanks,

-- Steve


On Mon, 2013-03-11 at 15:13 +0800, zhangwei(Jovi) wrote:
> trace_empty is checking in while-loop, so the previous checking
> is totally redundant, and more worse, the first trace entry is losted.
> 
> so remove it.
> 
> Signed-off-by: zhangwei(Jovi) <jovi.zhangwei@...wei.com>
> ---
>  kernel/trace/trace_kdb.c |    3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/kernel/trace/trace_kdb.c b/kernel/trace/trace_kdb.c
> index 3c5c5df..6489b2e 100644
> --- a/kernel/trace/trace_kdb.c
> +++ b/kernel/trace/trace_kdb.c
> @@ -57,8 +57,7 @@ static void ftrace_dump_buf(int skip_lines, long cpu_file)
>  		ring_buffer_read_start(iter.buffer_iter[cpu_file]);
>  		tracing_iter_reset(&iter, cpu_file);
>  	}
> -	if (!trace_empty(&iter))
> -		trace_find_next_entry_inc(&iter);
> +
>  	while (!trace_empty(&iter)) {
>  		if (!cnt)
>  			kdb_printf("---------------------------------\n");


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